diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index c84c537..9ad7849 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -14,4 +14,4 @@ jobs:
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm i
-    - run: npm test
+    - run: npm run nyc_mocha_wasm
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 1256879..8a33139 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -14,4 +14,4 @@ jobs:
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm i
-    - run: npm test
+    - run: npm run nyc_mocha_wasm
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index b95e8b3..c160d11 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -14,4 +14,4 @@ jobs:
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm i
-    - run: npm test
+    - run: npm run nyc_mocha_wasm
diff --git a/package.json b/package.json
index 0ed9d84..9bf5e8d 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,6 @@
     "watch": "mocha --watch",
     "build.web": "browserify ./lib/vcd-web.js | terser --compress -o demo/vcd-web.min.js",
     "watch.web": "watchify ./lib/vcd-web.js -o demo/vcd-web.min.js -v",
-    "install": "node bin/build.js",
     "prepare": "node bin/build.js"
   },
   "files": [
diff --git a/test/wasm_any.js b/test/wasm_any.js
index bf2220b..985dfba 100644
--- a/test/wasm_any.js
+++ b/test/wasm_any.js
@@ -1,13 +1,14 @@
 'use strict';
 
 const expect = require('chai').expect;
-const lib = require('../lib/index.js');
+const createVCD = require('../out/vcd.js');
+const webVcdParser = require('../lib/web-vcd-parser.js');
 
 describe('wasm any', function () {
 
   it('simple any', function (done) {
-    lib.createVCD().then(mod => {
-      lib.webVcdParser(mod).then(inst => {
+    createVCD().then(mod => {
+      webVcdParser(mod).then(inst => {
         const dump = [];
 
         inst.change.any((id, time, cmd, value, mask) => {
diff --git a/test/wasm_basic.js b/test/wasm_basic.js
index 60b8adb..0bae160 100644
--- a/test/wasm_basic.js
+++ b/test/wasm_basic.js
@@ -1,24 +1,25 @@
 'use strict';
 
 const expect = require('chai').expect;
-const lib = require('../lib/index.js');
+const createVCD = require('../out/vcd.js');
+const webVcdParser = require('../lib/web-vcd-parser.js');
 
 describe('wasm basic', () => {
 
   it('typeof vcd', async function () {
-    const mod = await lib.createVCD();
+    const mod = await createVCD();
     expect(mod).to.be.an('object');
   });
 
   it('typeof vcd instance', async function () {
-    const mod = await lib.createVCD();
-    const inst = await lib.webVcdParser(mod);
+    const mod = await createVCD();
+    const inst = await webVcdParser(mod);
     expect(inst).to.be.an('object');
   });
 
   it('fail: foo bar', async function () {
-    const mod = await lib.createVCD();
-    const inst = await lib.webVcdParser(mod);
+    const mod = await createVCD();
+    const inst = await webVcdParser(mod);
     expect(inst.write(Buffer.from(' foo bar ???'))).to.eq(true);
     expect(inst.info).to.deep.eq({
       stack: [{}],
@@ -28,8 +29,8 @@ describe('wasm basic', () => {
   });
 
   it('$comment', async function () {
-    const mod = await lib.createVCD();
-    const inst = await lib.webVcdParser(mod);
+    const mod = await createVCD();
+    const inst = await webVcdParser(mod);
     expect(inst.write(Buffer.from(
       ' \n $comment some text $end $comment more text $end ???'
     ))).to.eq(true);
@@ -42,8 +43,8 @@ describe('wasm basic', () => {
   });
 
   it('$version', async function () {
-    const mod = await lib.createVCD();
-    const inst = await lib.webVcdParser(mod);
+    const mod = await createVCD();
+    const inst = await webVcdParser(mod);
     expect(inst.write(`
 $version Generated by VerilatedVcd $end
 $date Wed Sep 18 22:59:07 2019
diff --git a/test/wasm_dump.js b/test/wasm_dump.js
index 57779b8..d6119c1 100644
--- a/test/wasm_dump.js
+++ b/test/wasm_dump.js
@@ -1,13 +1,14 @@
 'use strict';
 
 const expect = require('chai').expect;
-const lib = require('../lib/index.js');
+const createVCD = require('../out/vcd.js');
+const webVcdParser = require('../lib/web-vcd-parser.js');
 
 describe('wasm dump', function () {
 
   it('simple wasm', function (done) {
-    lib.createVCD().then(function (mod) {
-      lib.webVcdParser(mod).then(function (inst) {
+    createVCD().then(function (mod) {
+      webVcdParser(mod).then(function (inst) {
         const dump = [];
         ['"}G', '{u', 'u)'] // array of all signal ids
           .map(id =>
diff --git a/test/wasm_events.js b/test/wasm_events.js
index eb72d05..8c09593 100644
--- a/test/wasm_events.js
+++ b/test/wasm_events.js
@@ -1,13 +1,14 @@
 'use strict';
 
 const expect = require('chai').expect;
-const lib = require('../lib/index.js');
+const createVCD = require('../out/vcd.js');
+const webVcdParser = require('../lib/web-vcd-parser.js');
 
 describe('wasm events', () => {
 
   it('$enddefinitions', async function () {
-    const mod = await lib.createVCD();
-    const inst = await lib.webVcdParser(mod);
+    const mod = await createVCD();
+    const inst = await webVcdParser(mod);
 
     inst.on('$enddefinitions', () => {
       expect(inst.info).to.deep.eq({